Google announced they are now going to expand Google Funding Choices (link my not work for you so go here instead) to more countries.
Google Funding Choices is a program to help publishers recover lost revenue due to ad blockers by having the users pay to not show ads on your site. When a visitor arrives at a site using an ad blocker, Funding Choices allows the site to display one of three message types to that user. Here is one of those messages, you can see more on the Google blog post:
The 31 counties this will be available in within the upcoming weeks are Australia, Germany, New Zealand, Austria, Greece, Norway, Belgium, Hungary, Poland, Bulgaria, Iceland, Portugal, Canada, Ireland, Romania, Croatia, Italy, Slovakia, Cyprus, Latvia, Slovenia, Czech Republic, Liechtenstein, Spain, Denmark, Lithuania, Sweden, Estonia, Luxembourg, Switzerland, Finland, Malta, United Kingdom, France, Netherlands, and United States.
Google said "on average, publishers using Funding Choices are seeing 16 percent of visitors allow ads on their sites with some seeing rates as high as 37 percent."
For more details on this, check out the Google help docs.
Forum discussion at WebmasterWorld.